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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494468d139c48f4d60006bcd6d4acf81431d1f288611e6ada91615aae5db6af5' 
  AND token = 'Xq5UlkZmN85aUyNHjrveVdIIwwncXB0Ja1A5eluVtE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}